Automatic tooth setter for saws



April 1950 I B. N. ENGLE ET AL 2,504,399

AUTOMATIC TOOTH SETTER FOR SAWS Filed March 25, 1948 I I I 240 mm & F/GZZ.

. 8019/? M Eva/.5 65 66 dohw B.Ev6L- Patented Apr. 18, 1950 AUTOMATIC TOOTH SETTER FOR SAWS Burr N. Engle and John B. Engle, Los Angeles, Calif.

Original application June 18, 1946, Serial No.

677,617, now Patent No.

2,441,404, dated May 11, 1948. Divided and this application March 23, 1948, Serial No. 16,515

4 Claims.

This application is a division of the invention set out in application Serial Number 677,617, filed June 18, 1946, which matured as Patent No. 2,441,404, dated May 11, 1948.

The invention concerns means for setting the teeth of saws in which all the operations are automatic except the shifting of the saw blade which is done by hand. Automatic means may also be employed for shifting the blade, but this invention is concerned with the means of setting the teeth.

One of the principal objects of this invention is to provide a double acting means for setting each tooth of the saw blade in consecutive order, this making it easyto set all the teeth of the saw blade by running the blade through the device just once.

Another object is to present a new and novel saw tooth setter which is reliable and Very serviceable, easy and simple to operate, sturdy and simple in construction, and which is economical to make and manufacture.

Other objects, advantages and features of our invention will appear from the accompanying drawings, the subjoined detailed description, the preamble of these specifications and the appended claims.

Applicants are about to illustrate and describe one of the forms of their invention in order to teach the art of using it, but it is to be understood that the drawings and description thereof are not to limit the invention in any sense whatsoever, except as clearly limited by the appended claims.

In the drawings:

Figure 1 is a side elevational view of the device with parts broken away to show some interior parts,

Figure 2 is a vertical view taken substantially along the line 2--2 of Fig. 1,

Figure 3 is an elevational view of a detailed part of the invention taken apart from that shown in Fig. 1,

Figure 4 is a schematic wiring diagram for the electrical parts employed.

The illustrated device of this form of the invention has the bracket 40 which can be bolted to a vertical Wall of any thing suitable for supporting it. This bracket supports the two spaced electromagnets 4| and 42 and their shiftable plunger element 43. The magnets are fixed to a yoke 44, the base of which is bolted to the top of the bracket, as shown. The magnet 42 has its iron clad shell welded or otherwise securely fixed to one portion of the yoke and the other 'the block 41 as at 47.

magnets shell is fixed'to another portion of the yoke at 4! :by bolts so that it can be removed when it is desired.

Each electromagnet has a bore 45 adapted to receive one end of the plunger in sliding relationship therewith, and within each bore at the threaded end thereof is a magnetic intensifying plug 46 which is threaded so that it can be adjusted within the bore and thus limit the movement of the plunger 43 and determine the strength of its action. Welded or otherwise fixed to the base of the yoke there is an elongated block 41 in alinement with an adjustable viselike elongated block 48, this latter block and block 47 providing the groove through which the saw blade is slid as its teeth are set. The block 48 is adjusted to position by the usual viselike turn buckles 49 which are threaded through the outer lower end of the yoke as shown.

Guides 50 and 5| are fixed to and supported upon the block 41, and are designed to receive the top ends of the saw teeth and maintain the teeth in proper alinement for the setting operation, the blade of the saw is indicated at 52. The plunger is clearly shown in Figure 3, but this is only one of the plungers in that other plungers are required for other sizes of saws requiring a diiierent setting. At the center portion of the plunger there is an opening or cut-away portion 53, the depth of the out being sufficient to accommodate the teeth of the saw to be set, and the sides of the out have the bevelled hammerlike surfaces 54 and 55. These surfaces are hardened and make sufficient forceful contact with opposite sides of alternate teeth of the saw to bend them, or set them, to their proper angle. Other plungers would be substituted for the one shown when larger or smaller teeth are to be set.

The means for controlling the operation of the plungers through their respective magnets is shown in Figs. 2 and 4, such means being omitted in Fig. 1 in order to better illustrate the device. A toothed wheel 56, having a plurality of teeth of substantially the same size as the saws teeth which are to be set, is suitably journalled upon the block 41, and this wheel is provided with the escapement 51 which is suitably pivoted upon The wheel is maintained in mesh relationship with the saw teeth by fixing its pivot to the base 40. This wheel may be changed to one having smaller or larger teeth when the teeth of the saw to be set require it. The escapement is pivoted to any suitable bracket extending from the base 40 and it has a stiff ribbon spring 58 which has upon the end thereof double headed electrical contact points 59, the opposite faces of which are adapted to alternately make good electrical contact with the fixed contact points 60 and 6|. Insulated wires 69 and BI extend from their respective contacts and make good connection with one end only of the windings 62 and 63 of the electromagnets 4| and 42. The other ends of the windings are grounded to the metal yoke as well as with the block 41. The current supply indicated at 64 is preferably 110 volts, 60 cycles, of alternating current of the kind now generallyused for domestic lighting purposes.

One leg of the current supply is grounded to the block 41, as indicated at 65; andthe other leg is broken by the single throw hand switch 66; but this line leads via of the switch to a point 61 where it branches off to make connectiomwith.

the pivot point 41 of theescapement. A pair of hand switches 69 and 10 are provided, asshown, and these switches make connection with the wire leads from the contacts 60 and 6|.

By the above arrangement, the escapement operates the magnets alternately so as to shift'the plunger in opposite directions for the teeth setting job. The hand switches 69 and 10 are provided for hand control of the magnets when it is desired to do so independently of the automatic feature; but when this is done, the hand switch II should be open.

It is, of course, understood that various changes and modifications may be made in the details of form, style, design and construction of the whole or any part of the specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the limitations clearly expressed in the following claims:

We claim: 1. In a tooth setting device for saw blades, a

main supporting element having mountedand fixed thereto a pair of spaced apart electromagnets, a plunger having its ends in the pair of electromagnets and bridging the space between them, means in the plunger to receive a saw blade, each side of the means having bevelled surfaces for setting the teeth of a saw blade, means for automatically and alternately energizing the electromagnets.

2. The tooth setting device recited in claim 1 wherein the means for automatically energizing the electromagnets include an escapement device to cause the plunger to reciprocate in periodic fashion.

3. Ina tooth setting device for saw blades and the like, a main supporting base element having mounted upon and fixed thereto a pair of spaced apart electromagnets with alined bores therein, a single plunger having an end thereof in each one of the electromagnets and bridging the space between them, opening means in the plunger to receive the teeth edge of a saw blade, each side of the means having a hammer surface for setting teeth of a saw blade, escapement-like means having teeth which mesh with some of the teeth on the saw to be set and which operates a switching mechanism for automatically and alternately energizing the electromagnetsv as a saw blade is run through the said opening means.

4. The tooth setting device recited in claim 3 wherein the hammer surfaces are inclined at a predetermined angle, and wherein each solenoid of the electromagnets has an adjustable flux intensifier for regulating the plunger strength.

BURR N. ENGLE. JOHN B. ENGLE.

REFERENCES CITED The following references are of record inthe file of this patent:

UNITED STATES PATENTS Number Name Date 709,013 Hillstrom Sept. 16, 1902 1,373,308 Davison Mar. 29, 1921 1,819,139 Weibull et a1 Aug. 18, 1931 1,853,695 Mortimer Apr. 12, 1932 1,924,431 Zingheim Aug. 29, 1933 2,371,358 Sekells Mar. 13, 1945 

